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you may have to reinstall the O.S of the Phone.
They call it upgrading the Firmware and that will fix the issue!
And don't delete any files which are hidden under the folder " System"
That causes this issuedo not alter some
files in the phone and it ll not allow u to use any applications and games apart
from walkman and the Internet browser!hope this helps...

i could not open my game and application, it will display operation failed, and then i try to reformat it, but it is not work. please help my problem.games and applications are not open, if try to open that shown operation failed! how to solve this problem? please help vaen okay